The footer is straight forward enough. Forget about iframe. Just recreate it in WD and designate it a footer and repeat on all pages. It will appear on all pages the same distance from the bottom of the page regardless of the page length.

And actually, now that I look at your header and buttons, just recreate this in WD. It's so simple there is no reason to jump through hoops. Just take two minutes and recreate it.

You're making all this too hard.